<?php
class JSSDK {
  private $appId;
  private $appSecret;
  private $tools = null;

  public function __construct($appId, $appSecret) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
    $this->tools = new Tools();
  }

  public function getSignInfo() {

    
    $jsapiTicket = $this->getJsApiTicket();
    $url = $_SERVER['HTTP_REFERER'];
    $timestamp = time();
    $nonceStr = $this->createNonceStr();
    $token = $this->getAccessToken();

    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
    $signature = sha1($string);

    $signPackage = array(
      "appId"     => $this->appId,
      "accessToken" => $token,
      "nonceStr"  => $nonceStr,
      "timestamp" => $timestamp,
      "signature" => $signature,
      "url"=>$url
    );

    return $signPackage; 
  }

  private function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

  private function getJsApiTicket() {
    // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
    $ticket = null;
    $filePath = dirname(__FILE__) . DIRECTORY_SEPARATOR .'jsapi_ticket.json';
    
    if (file_exists($filePath)) {
    
         $data = json_decode($filePath);
          if ($data->expire_time < time()) {
              $ticket = $data->ticket;
          }
    }

    if($ticket == null ){
        $accessToken = $this->getAccessToken();
        
        $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=".$accessToken;
        $res = $this->tools->httpRequest($url);
        $ticket = $res["ticket"];
        if ($ticket) {
          $data->expire_time = time() + 7000;
          $data->jsapi_ticket = $ticket;
          $fp = fopen($filePath, "w");
          fwrite($fp, json_encode($data));
          fclose($fp);
        }

    }
    

   
    /*if ($data->expire_time < time()) {
      $accessToken = $this->getAccessToken();
      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = json_decode($this->httpGet($url));
      $ticket = $res->ticket;
      if ($ticket) {
        $data->expire_time = time() + 7000;
        $data->jsapi_ticket = $ticket;
        $fp = fopen("jsapi_ticket.json", "w");
        fwrite($fp, json_encode($data));
        fclose($fp);
      }
    } else {
      $ticket = $data->jsapi_ticket;
    }
*/
    return $ticket;
  }

   

  private function getAccessToken() {
    $conn = new CreateConnection();
    $access_token = $conn->getAccessToken(CORPID,CORPSECRET);
    return $access_token ;

    /*// access_token 应该全局存储与更新，以下代码以写入到文件中做示例
    $data = json_decode(file_get_contents("access_token.json"));
    if ($data->expire_time < time()) {
      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
      $res = json_decode($this->httpGet($url));
      $access_token = $res->access_token;
      if ($access_token) {
        $data->expire_time = time() + 7000;
        $data->access_token = $access_token;
        $fp = fopen("access_token.json", "w");
        fwrite($fp, json_encode($data));
        fclose($fp);
      }
    } else {
      $access_token = $data->access_token;
    }
    return $access_token;*/
  }

  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
  }
}
?>